org.gridgain.grid.spi.loadbalancing.adaptive
Class GridAdaptiveJobCountLoadProbe

java.lang.Object
  org.gridgain.grid.spi.loadbalancing.adaptive.GridAdaptiveJobCountLoadProbe

All Implemented Interfaces:

GridAdaptiveLoadProbe

public class GridAdaptiveJobCountLoadProbe
extends Object
implements GridAdaptiveLoadProbe

Implementation of node load probing based on active and waiting job count. Based on GridAdaptiveJobCountLoadProbe.setUseAverage(boolean) parameter, this implementation will either use average job count values or current (default is to use averages).

The load of a node is simply calculated by adding active and waiting job counts.

Below is an example of how CPU load probe would be configured in GridGain Spring configuration file:

 <property name="loadBalancingSpi">
     <bean class="org.gridgain.grid.spi.loadbalancing.adaptive.GridAdaptiveLoadBalancingSpi">
         <property name="loadProbe">
             <bean class="org.gridgain.grid.spi.loadbalancing.adaptive.GridAdaptiveJobCountLoadProbe">
                 <property name="useAverage" value="true"/>
             </bean>
         </property>
     </bean>
 </property>
 

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Author: 2005-2008 Copyright © GridGain Systems. All Rights Reserved. ver. 2.0.3

	Nikita Ivanov, GridGain Systems nivanov@gridgain.com
	Dmitriy Setrakyan, GridGain Systems dsetrakyan@gridgain.com
	Alexander Magdenko, GridGain Systems amagdenko@gridgain.com
	Boris Suchodoev, GridGain Systems bsuchodoev@gridgain.com
	Denis Kharlamov, GridGain Systems dkharlamov@gridgain.com
	close

Constructor Summary

GridAdaptiveJobCountLoadProbe()
Initializes active job probe.

GridAdaptiveJobCountLoadProbe(boolean useAvg)
Creates new active job prove specifying whether to use average job counts vs. current.

Method Summary

double	getLoad(GridNode node, int jobsSentSinceLastUpdate) Calculates load value for a given node.
boolean	isUseAverage() Gets flag indicating whether to use average job counts vs. current.
void	setUseAverage(boolean useAvg) Sets flag indicating whether to use average job counts vs. current.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GridAdaptiveJobCountLoadProbe

public GridAdaptiveJobCountLoadProbe()

Initializes active job probe.

GridAdaptiveJobCountLoadProbe

public GridAdaptiveJobCountLoadProbe(boolean useAvg)

Creates new active job prove specifying whether to use average job counts vs. current.

Parameters:

useAvg - Flag indicating whether to use average job counts vs. current.

Method Detail

isUseAverage

public boolean isUseAverage()

Gets flag indicating whether to use average job counts vs. current.

Returns:

Flag indicating whether to use average job counts vs. current.

setUseAverage

public void setUseAverage(boolean useAvg)

Sets flag indicating whether to use average job counts vs. current.

Parameters:

useAvg - Flag indicating whether to use average job counts vs. current.

getLoad

public double getLoad(GridNode node,
                      int jobsSentSinceLastUpdate)

Calculates load value for a given node. Specific implementations would usually take into account some of the values provided by GridNode.getMetrics() method. For example, load can be calculated based on job execution time or number of active jobs, or CPU/Heap utilization.

Note that if GridAdaptiveLoadProbe.getLoad(GridNode, int) returns a value of 0, then implementation will assume that load value is simply not available and will try to calculate an average of load values for other nodes. If such average cannot be obtained (all node load values are 0), then a value of 1 will be used.

Specified by:

getLoad in interface GridAdaptiveLoadProbe

Parameters:

node - Grid node to calculate load for.

jobsSentSinceLastUpdate - Number of jobs sent to this node since last metrics update. This parameter may be useful when implementation takes into account the current job count on a node.

Returns:

Non-negative load value for the node (zero and above).

toString

public String toString()

Overrides:

toString in class Object